Vintage Fish Plate Holders

How cute are these vintage paper plate holders?! Four of each in yellow and teal. Some minor discoloration with age but otherwise in good condition. I never used these and only kept them stored safely in my cabinet. Back fin says: Universal Plastic Mold. Inside circle says: Serva-Plate, Holds Paper Plates, Ideal for Barbeques, Picnics, Camping, Parties.